For example, today: Europe, Asia and in a practical sense, Africa are all connected but contain several different plates. The Indian Plate and the Eurasian plate are 2 different plates but the land is connected, so you'd never know it was two plates - well, except for the frequent earthquakes.
Source: http://en.wikipedia.org/wiki/Indian_Plate
Plate Tectonics is thought to be about 3.2 billion years old: http://sciencenordic.com/modern-plate-tectonics-arose-32-billion-years-ago